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  #1  
Old 06-05-2002, 10:25 PM
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'76 450 SL heater

I know this is the wrong season... being summer and all, but I figure now is the best time to start working on my heater problems...

I have no heat. It seems that the levers in my console don't do anything at all. Here's the question... how do I tear apart the heater box without having to remove it from the car? Is there a way to "verify" that coolant is flowing through the core without blowing coolant all over the place?

Any ideas or suggestions would be greatly appreciated!

Thanks!
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  #2  
Old 06-05-2002, 10:41 PM
PKash
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You can take the box off Im sure it's prolly the culprit

Plus when I was going to get mine fixed my mechanic disconectedd the hoses and it ran fine. You can take the four hoses and run them together bypassing the unit till you buy a new one.
They are about 400 I think? don't quote me good luck
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Old 06-06-2002, 12:17 PM
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Check out: http://www.mbz.org/info/articles/hvac/monovalve/

If your monovalve hasn't been replaced, it probably needs to be. It's an inexpensive thing to check and could be causing your problem.

Somebody sells a replacement kit on eBay.
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  #4  
Old 06-06-2002, 12:53 PM
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does a '76 have a monovalve? If so... where do I look for it? How do I test it?

Thanks
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  #5  
Old 06-07-2002, 01:02 AM
sbr
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I believe the monovalve started with the '81 380SL. I don't have one in my '79 450SL.

sbr
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  #6  
Old 06-08-2002, 08:42 PM
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Feel the hose for temp. you should have a vacuum heater valve on the fire wall, move the heater lever and see if the valve moves.
If the valve dos not move try working it by hand.
You can test the valve for vacuum leaks with a Mityvac.
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  #7  
Old 06-08-2002, 10:41 PM
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Lets get this sorted out a little.
First, I believe "mburman" is referring to removing either the whole heater box (the whole thing inside the dash) which I don't believe is neccesary.
I also don't believe this 76 has the mono-water valve, it has the servo-motor assembly.
The servo-motor assembly is the "usual suspect", there are diagnostic routines that are used to diagnose the system.
The inside of the servo-motor is quite complex and prone to seizing after years of use.
You should either seek out a mechanic familiar with the servo-motor type of climate control, or if you're a gambling man, buy a new servo-motor assembly.
Gilly
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  #8  
Old 06-10-2002, 09:54 AM
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The sorting hat...

Ok... Yes I am talking about the heater box inside the console. I don't have climate control so I'm pretty sure I don't have a servo-motor. I also am pretty sure I don't have a monovalve. I have four levers and two knobs on the center console panel. The two on the left control the drivers side temp and defroster outlets, the two on the right control the passenger side temp and the floor air vents. The vacuum control for the water valve in the engine compartment is missing so I have the valve manually pushed open. Assuming water is flowing throught the heater core, something must be wrong with the heater box inside the car. That's what I'm trying to trouble shoot! Sorry if I confused everyone!!!

With that said... HELP!!!

Thanks
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  #9  
Old 06-10-2002, 10:54 PM
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Michael:
You won't be able to do any repairs to the heater core without removing the dash and then the box. The heater core normally is not a problem unless it leaks coolant. i think you have a control problem, not a heater core problem. Sounds like it's too cobbled up for me to be of any help. Maybe the manual valve is no good?
Gilly
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  #10  
Old 11-21-2003, 06:27 PM
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did you ever fix the heater control problem? if so, how, i just broke my driver side heater control lever, my heat has been either on or off, nothing in between, thanx
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